Blast furnaces were the most common way to make iron and steel in this time.

Transcription

1 Blast furnaces were the most common way to make iron and steel in this time. A blast furnace is a tall metal cylinder with openings to 1. put raw materials in, 2. blow air in (the blast ), 3. remove impurities, and 4. take the liquid metal out. A blast furnace can make a ton of steel out of three tons of coal, two tons of iron ore, and half a ton of limestone. Limestone can be found in many places around the world. Only a few places have good deposits of coal or iron. Because a blast furnace is expensive to build, it has to run 24 hours a day. It makes a huge amount of steel, so it is better to be close to customers. In this time, the biggest users of steel were people who build railroads, bridges, and large buildings. When do you think this was: 1790s, 1890s, or 1990s? Why? Electric-arc furnaces were the most common way to make steel in this time. An electric-arc furnace can make a ton of steel out of two tons of scrap iron (sheet-steel trimmings and old cars) and taconite (a low-grade iron ore). A single electric furnace makes less than a blast furnace, but more than a charcoal oven. It needs a reliable supply of cheap electricity. This can come from coal-fired generators, hydroelectric dams, or nuclear reactors. An electric furnace can make different alloys (mixtures of metals) for special uses. It needs fewer workers than a blast furnace, but they must follow complex procedures. In this time, the main uses of steel were in buildings, automobiles, and home appliances such as stoves or refrigerators. These things were made in many places around the world. When do you think this was: 1790s, 1890s, or 1990s? Why? Charcoal ovens were the most common way to make iron and steel in this time. A charcoal oven can make a ton of iron out of about two tons of bog iron ore and four to five tons of charcoal (made from about 5-7 tons of trees, preferably pine). If you have ever picked up a recently cut pine log, you know the wood has a lot of sticky sap in it. The logs must be heated in ovens to drive out the sticky resins and leave charcoal, which is nearly pure carbon. Charcoal ovens are usually small, because a big oven would soon consume all the trees near the factory. In this time, the major uses of iron were for wagon wheels, guns, tools, and small parts such as door hinges. Most of these items can be forged in a small blacksmith shop. Blacksmith workers must be strong enough to use a heavy hammer all day long. When do you think this was: 1790s, 1890s, or 1990s? Why?

2 RESPONSE SHEET IRON AND STEEL Name 1) Choose two locations for iron-making factories in the late 1700s. Try to put each factory close to population centers and sources of the heaviest raw materials that were needed by the iron-making technology of the time. Write the letters of the locations you recommend for the factories: and 2) By the late 1800s, iron-making technology had changed. Choose three locations on the map for factories. Try to put each factory where it can get or easily transport the heaviest raw materials needed by the iron-making technology of the time. Write the letters of the three locations you recommend:,, and 3) If you abandoned a location that you chose in question 1, what is its letter? Why did you decide to abandon the factory that location? 4) By the late 1900s, iron-making technology had changed again. Choose four map locations for factories. Try to put each factory where it can get or easily transport the heaviest raw materials that were needed by modern iron-making technology. Write the letters of the four locations you recommend:,,, and 5) If you abandoned a location that you chose in question 2, what is its letter? Why did you decide to abandon the factory that location?

3 Locational considerations for an iron/steel factory What kinds of places were likely to grow or decline in each time period? For each time period, fill in the ovals that identify the considerations that would be important at that time. On the line, write a phrase to indicate what kind of location you would choose as a result of that knowledge. For example, you might choose a location near a forest at a time when charcoal is a main source of energy. Source of energy Solar power Charcoal Bituminous coal Hydroelectrici dam Nuclear reactor Source of iron Bog iron ore Hematite Taconite Scrap iron 1790s 1890s 1990s influence on choice of location for factory Mode of transportation Horse cart Canal boat Railroad Highway truck Workers needed Treecutters Bog iron haulers Ore miners Railroad engineers Furnace loaders Computer operators Major users of iron or steel Military weapons Wagon wheels Nails and hinges Railroad rails Home appliances Hi-rise construction On a separate piece of paper, write a recommendation to a factory owner, explaining what kind of location would be good for an iron/steel factory at each time. Cite specific things you think should be close to the factory.

4 Each letter (A-M) on this map identifies a city that you might choose as a location for your iron factory at different times in history. Small deposits of bog iron occur in many places in the glacier-formed swamps that are common throughout the northern half of Europe, especially in Britain, Sweden, Finland, North Germany, Poland, and northern Russia. The small dots on the map represent high-grade deposits of hematite iron ore; the small c s represent coal deposits. Limestone is available in most parts of the continent, and forests cover the northern half of the continent and the higher mountain areas of the south. Read the descriptions of iron-making technology at different time periods. Using those descriptions, try to figure out what resources are needed at each time; your goal is to locate factories in places where they can get those resources locally (or move them easily to the factory with the transportation technology that is available at the time) Teachers may reproduce for use in their own classrooms; for other uses, contact pgersmehl@gmail.com

5 Iron Production Technologies: Raw Materials and Proposed Mill Locations C F N M B E G H K L P J S R A T U W R a w Ma teria ls B og Iron O re D H ema tite Iron O re B ituminous C oa l P iney W oods Miles L etters a re potentia l s ites for s teel mills.